The tip of the thing was equipped with long whiplike appendages that writhed around a loose, drooling, toothless mouth large enough to swallow a man whole...Perhaps this was the only thing that the escaping Lovecraftian entity had thus far been able to extrude between the opening Gates — this one finger.

Of, pertaining to, or emulating the style or works of author H.P. Lovecraft (1890-1937).

The term Lovecraftian is especially used to describe fictional creatures with terrifyingly unnatural anatomy, such as misplaced organs and additional limbs. It may also describe beings with combinations of features from disparate creatures normally shunned, such as combining tentacles, bat-wings, and scales.

The tip of the thing was equipped with long whiplike appendages that writhed around a loose, drooling, toothless mouth large enough to swallow a man whole...Perhaps this was the only thing that the escaping Lovecraftian entity had thus far been able to extrude between the opening Gates — this one finger.

The adjective which best describes the Myxini is "Lovecraftian". Hagfish are long, slender and pinkish, and are best known for the large quantities of sticky slime which they produce. Hagfish have three accessory hearts, no cerebrum or cerebellum, no jaws or stomach, and will "sneeze" when their nostrils clog with their own slime.